Rabus, Bernd and Lang, Oliver (2002) On the Representation of Ice Shelf Grounding Zones in SAR-Interferograms. Journal of Glaciology, Vol. 48 (No. 162), pp. 345-356.
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We investigate limitations of the one-dimensional elastic beam model to detect grounding line and thickness of an ice shelf from a differential interferogram. Spatial limitations due to grounding line curvature and variable ice thickness are analyzed by comparison with two-dimensional plate flexure. Temporal limitations from the tide-dependent shift of the grounding line are analyzed by superpositions of four tidal flexure profiles representing differential interferograms. (i) At scales greater one ice thickness seaward protrusions of the grounding line are well represented by the elastic beam model, while landward embayments of the same scale produce significant misplacements >10 per cent of the ice thickness. (ii) For reasonable spatial variations of shelf thickness the elastic beam model gives reliable estimates of grounding line position and unfractured mean ice thickness near the grounding line. (iii) For about 20 per cent of superpositions of four tidal flexure profiles the resulting grounding line misplacements exceed the physical tidal shift of the grounding line by factors >2. For differential tide levels <10 per cent of a 1 m tide dynamics, a physical shift of the grounding line of 0.3 km per meter of tide can lever misplacements of >2 km. Examples of real interferometric profiles from West Antarctic ice shelves corroborate our results.
|Title:||On the Representation of Ice Shelf Grounding Zones in SAR-Interferograms|
|Journal or Publication Title:||Journal of Glaciology|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 345-356|
|Keywords:||Glaciology, Interferometry, Modelling|
|HGF - Research field:||Aeronautics, Space and Transport (old)|
|HGF - Program:||Space (old)|
|HGF - Program Themes:||W EO - Erdbeobachtung|
|DLR - Research area:||Space|
|DLR - Program:||W EO - Erdbeobachtung|
|DLR - Research theme (Project):||UNSPECIFIED|
|Institutes and Institutions:||German Remote Sensing Data Center|
|Deposited By:||elib DLR-Beauftragter|
|Deposited On:||29 Mar 2006|
|Last Modified:||06 Jan 2010 12:15|
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